Active Chitosan/Polycaprolactone Bilayer Films Including D-Limonene and Nanocellulose

Abstract

The objective of this study was to evaluate the effect of polycaprolactone (PCL) on the physical and active properties of films when coated on chitosan (CH) film. D-limonene (5%, w/w) and nanocellulose (N) (2%, w/w) were added to CH film solutions, and then coated with PCL to develop active bilayer-films for food packaging applications. Film samples were characterized by permeability tests, optical analysis, antioxidant and antimicrobial activity tests. PCL layer on CH improved the permeability while bilayer films were observed as more opaque. The addition of D-limonene into CH films caused a decrease in the water vapor permeability and light transmittance values of the film samples, however, this decrease was not high those observed in bilayer films. Film samples including D-limonene showed both antioxidant capacity and antimicrobial activity against selected bacteria.

Keywords

• Chitosan
• Polycaprolactone
• D-limonene
• Nanocellulose
• Active bilayer film

D-Limonen ve Nanoselüloz İçeren Aktif Kitosan/Polikaprolakton İki Katmanlı Filmler

Abstract

Bu çalışmanın amacı, polikaprolaktonun (PCL), kitosan (CH) film üzerine kaplandığında, PCL ikinci katmanının filmlerin fiziksel, antioksidan ve antimikrobiyal özellikleri üzerine etkisini değerlendirmektir. D-limonen (%5, w/w) ve nanoselüloz (N) (%2, w/w), CH film çözeltilerine ilave edilmiş ve daha sonra gıda ambalajlama uygulamaları için PCL ile kaplanarak aktif çift katmanlı filmler elde edilmiştir. Film örnekleri optik analiz, geçirgenlik testleri, antioksidan ve antimikrobiyal aktivite testleri ile karakterize edilmiştir. CH üzerindeki PCL katmanı filmlerin su buharı geçirgenliğini geliştirirken, çift katmanlı filmler daha opak olarak gözlenmiştir. CH filmlere D-limonen ilave edilmesi, film örneklerinin su buharı ve ışık geçirgenlik değerlerinde azalışa neden olmuştur ancak bu azalış iki katmanlı filmlerde gözlenen azalış kadar yüksek değildir. D-limonen içeren film örnekleri hem antioksidan kapasite hem de seçilen bakterilere karşı antimikrobiyal aktivite göstermiştir.

Keywords

• Kitosan
• Polikaprolakton
• D-limonen
• Nanoselüloz
• Nanoselüloz
• Aktif iki katmanlı film

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